Walter Russell - Sculptor, Painter, Author, although here I'm principally concerned with his curious New Age Philosophy that all is light, an epiphany he had while apparently in a 39 day "Coma" in 1921.
Link: Wikipedia on Walter Russell
Paris Review (for colourful illustrations)
And a Copy of "The UNIVERSAL ONE" on the Internet Archive. A little searching and you will find others of his books online.